Yes Blast, you can set up a neighborhood wi-fi intranet.
Altho, from a security viewpoint this is not advisable.

And as stated, the only info you would have is what you already have on one of the computers. Still, would be quick and easy to pass info. Check on the web for info on how to do it, would be too long to post here, and I'm lazy.

If you want to be "really secure" see what the cost of running underground co-ax would be. I'm thinking probably not cost-effective in the long run, but a thought.